| 摘要: |
| 为阐明日粮中添加过瘤胃胆碱对围产期奶牛生产性能和能量代谢的影响,选取年龄、胎次和泌乳量相近的健康荷斯坦奶牛40头,随机分为4组,每组10头。Ⅰ、Ⅱ、Ⅲ组每天分别在基础日粮中添加5、10和20 g过瘤胃胆碱,Ⅳ组饲喂基础日粮。试验期内(产前14 d~产后42 d)分别调查和检测奶牛的生产性能(泌乳量和干物质摄入量)、血液生化指标(葡萄糖、β-羟丁酸、游离脂肪酸、甘油三酯和胆固醇)和内分泌指标(胰岛素和胰高血糖素)。结果显示: 1)围产期奶牛日粮中添加过瘤胃胆碱能明显提高奶牛泌乳量(MY)和干物质摄入量(DMI),以每头奶牛每天添加10 g过瘤胃胆碱效果最好。2)围产期奶牛日粮添加过瘤胃胆碱,能延缓血浆葡萄糖(Glu)水平的下降(P<0.05),显著降低试验奶牛血浆β-羟丁酸(BHBA)、游离脂肪酸(NEFA)总胆固醇(TCHO)含量(P<0.05),与对照组相比,血浆甘油三酯(TG)有升高的趋势(P>0.05)。3)添加过瘤胃胆碱,有提高试验奶牛血浆胰岛素(Ins)含量、降低胰高血糖素(Gn)含量的趋势,但差异不显著(P>0.05)。上述结果表明围产期奶牛日粮添加过瘤胃胆碱能够提高奶牛的生产性能,改善奶牛体内脂肪代谢,促进体内糖异生作用,缓解围产期和泌乳早期奶牛的能量负平衡。 |
| 关键词: 奶牛 过瘤胃胆碱 生产性能 能量代谢 |
| DOI：10.11841/j.issn.1007-4333.2012.03.018 |
| 投稿时间：2011-11-14 |
| 基金项目:黑龙江省人事厅博士后启动金(LBH-Q08028); 国家科技计划项目(2012BAD12B05); 黑龙江农垦总局攻关项目(HNKXIV-08-01-07) |
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| Effect of rumen protected choline supplemented into diet on performance and energy metabolism of dairy cows in transition period |
|
ZHENG Jia-san, XIA Cheng, ZHANG Hong-you, XU Chuang
|
| (College of Animal Science and Technology,Heilongjiang Bayi Agricultural University,Daqing 163319,China) |
| Abstract: |
| To ascertain effect of rumen protected choline on performance and energy metabolism of dairy cows in transition period,In this experiment forty tested cows that were divided randomly into four groups (in turn group Ⅰ,Ⅱ,Ⅲ,Ⅳ 10 cows per group) from an intensive dairy farm.according to different dosage of rumen-protected choline (5,10,20 ,and 0 g dosage of choline,per day for each cow) supplemented into diet from day 14 before calving to day 42 after calving.production performances (MY,and DMI) were investigated,blood biochemical parameters (Glu、BHBA、NEFA、 TG、TCHO) and endocrine parameters (Ins,Gn) were also detected in transition period of tested cows at days 14,7 before calving,parturition and day 7,14,21,28,35 42 after calving.Results indicated that:1) rumen protected choline increased milk yield and dry matter intake of tested cows in transition period,and effect of 10 g dosage of choline is the best.2) compared to control group,concentration of plasma Glu significantly increases and of plasma NEFA,BHBA and TCHO markedly decrease,but of plasma TG do not change in all test groups.3) compared to control group,there is no significant difference in concentration of plasma Ins and Gn in all tested groups.These results suggested that rumen protected choline supplemented into diet may more effectively improve performance and fat metabolism,promote gluconeogenesis in vivo,ease the negative energy balance of dairy cows in transition period and during early lactation stage. |
| Key words: dairy cattle rumen protected choline performance energy metabolism |
